Paint-mill



W. W. DRAPER.

Patented Sept. '10. 1850.

Paint Mill.

N. FETERo'. Hum-mam Wanbinghm 0.6.

* to near the outer edge of the muller.

form a journal (03) and it has also a jourin em W. DRAPER, OFGREENFIELD, MASSACHUSETTS.

PAINT-MILL.

Specification of Letters Patent No.

To all whom it may concern:

Be it known that 1, TM. V. DRAPER, of Greenfield, in the county ofFranklin and State of Massachusetts, have invented a new and usefulImprovement in Mills for Grinding Paints and Like Substances; and I dohereby declare the following to be a full, clear, and exact descriptionof the same, ref erence being had to the annexed drawings, making a partof this specification, in which- Figure I is a perspective view. Figs.II and III are parts in detail, in all of which like letters indicatelike parts.

The nature of my invention consists in the shape of the grinding facegiven to the muller a, when it is combined with the smooth face of thebed a; viz: the face of the muller having broad depressions 7), 7),formed in it, extending from near its center to within a short distanceof its periphery, and a corresponding number of narrow discharginggrooves c, 0, that extend to the periphery of the same; one of whichgrooves is located immediately in front of each of the depressions, asshown in Fig. The object of the depressions b, b, in the muller, beingto keep a large body of paint in contact with the face of the bed andgradually distribute it between the grinding faces of the bed andmuller, while they at the same time prevent the escape of the painttherefrom before it is thoroughly levigated; the said grooves 0, 0,serving to collect the levigated paint after its passage over the smoothsurface of the muller face, between the rear edge of the depressions andthe grooves, and discharge the same at the periphery of the muller.

I construct a circular muller (a) of suitable metal, having on the facedepressions or feeders (b) for the purpose of receiving the paints orother substances to be reduced. These feeders extend from near thecenter, Close to each of these feeders I make a groove or channel (0)extending from near the feeder entirely to the edge so as to dischargethere. The muller is firmly fixed on a shaft (d) at right angles withits face, and to which retary motion is given by a pinion of commonconstruction. The shaft extends far enough beyond the face of the mullerto 7,630, dated September 10, 1850.

nal on the reverse end. The bed (a) is a. circular plate of suitablemetal having a cavity in the center ((Z) to receive the journal (cl). Ithas a rim (6) around it, rising above the face, and of such size as tobe capable of inclosing the muller within it. The bed has projections(f) on opposite sides forming a groove by which it is kept in place. Areceptacle (9) for the pigment to be ground is made on the back of thebed communicating with the face of it by the opening (72.); and the rim(6) is cut through at the bottom to allow a scraper (Z) of commonconstruction to play upon the edge of the muller. The frame in whichthese parts are placed is of wood or metal. It has on opposite sidesprojections (0) forming ways of such size as will fit loosely betweenthose (f) on the bed. A box (Z) is made at one end to receive onejournal of the shaft of the muller, and that on the other end rests inthe cavity ((Z) when the bed is placed on the ways (0). The bed isadjusted to the muller by a set screw (m) working against a triple-armedspring (01).

The opreation will be thus. The receptacle being filled, and the mullerput in rotation in the direction indicated, the paint or other materialis supplied by the feeders (7)) to the faces of the muller and of thebed, between which it is reduced, but any hard particles which mightfind their way between the faces, would instead of choking or stoppingthe mill, only cause the bed to yield at that particular side since itsposition is governed by the triple-armed spring. The levigated matter istaken up by the grooves (0) and discharged at the edge of the mullerwhere it is collected by the scraper.

hat I claim as my invention and desire to secure by Letters Patent, is VThe broad depressions b, b, in the face of the muller a, when combinedwith the discharging grooves c, 0, in the same, and with the planesurface of the bed a, substantially in the manner and for the purpose asherein set forth.

W. W. DRAPER.

Vitnesses ALPHEUs F. STONE, JOHN J. PIERCE.

